Crushing and grinding mill.



No. 759,643. PATENTED MAY 10, 1904. T. L. 6; T. J. STURTEVANT.

GRUSHING AND GRINDING MILL.

APPLICATION FILED JULY 14, 1903.

no MODEL. a SHEETS-SHEET z.

715' we, $W5ZZZ' PATENTED MAY 10, 1904.

T. L. & T. J. STURTEVANT.

GRUSHING AND GRINDING MILL.

775%62638 e 1 fifi 1214525;

UNITED STATES Patented May 10, 1904..

PATENT OFFICE.

THOMAS L. STURTEVANT, OF QUINCY, AND THOMAS J. STITURTEVANT, OF

VVELLESLEY, MASSACHUSETTS,

ASSIC-NORS TO STURTEVANT MILL COMPANY, OF-]?OR.I.LAND, MAINE, AND BOSTON, l\lASSACHUSET.lTS, A

CORPORATION OF MAINE.

CRUSHING AND GRINDING MILL.

SPECIFICATION formingpart Of Letters Patent No. 759,643, dated May 10, 1904:.

Application filed July 14, 1903. Serial No. 165,439. (No model.)

To all LII/b07721 111; may concern:

Be it known that we, THOMAS L. S'ron'rn- VANT, residing at Quincy, and T1 ioMAs J. Surna- TEVANT, residing at Wellesley, in the county 5 of Norfolk and State of Massachusetts, citi- Zens of the United States, have invented certain new and useful Improvements in Crushing and Grinding Mills, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide a vertical crushing-machine of such construction as to afford easy access to the interior of the mill, so that worn parts may be conven- I 5 icntly replaced, as also to provide antifriction and dust-proof bearings for the vertical shaft of the machine, so that the mill will run easily and so that the bearings will be durable.

In.carrying the invention into effect one part of the casing of the mill is hinged or pivoted to the other part thereof, the two parts of the casing being bolted together when the machine is in running condition, but when the fastening-bolts are removed the hinged portion of the casing may be swung aside to admit of easy access to the crushing-chamber of the mill. The vertical shaft of the mill is suspended from an upper bearing, which is preferably a ball-bearing, and is provided below its upper bearing portion with a square or reetangular part passing loosely through the crushing nuts or cones,whieh are thus loosely strung on said shaft, so as to rotate therewith. A key which passes through the squared portion of the shaft sustains the lower crushing nut or cone and on which lower crushing nut or cone the other crushing nuts or cones are superposed. The squared portion of the shaft also passes loosely into a sleeve the lower face 4 of which forms-one member of a grab-clutch, the other member of which clutch is formed at the upper end of the hub of a gear-wheel, into which the lower rounded end of the shaft extends, said gear-wheel meshing with a driv- 4 5 ing-pinion and having a depending sleeve, which is journalcd in the lower portion of the casing of the mill. Thus as the said gearwheel is rotated from its driving-pinion it w ill, through the grab-clutch referred to, impart rotary movements to the vertical shaft of the mill and to the crushing nuts or cones mounted on the squared portion of the said shaft. When, however, it is desired to dismount or remove any of the crushing members of the mill, the said vertical shaft, the upper bearing of which is provided with a hoisting-eye, may be lifted out of the mill by any suitable hoisting device after the key which sustains the lower cone or shell has been removed, and which key is easily accessible when the hinged portion of the mill has been swung aside. Thus after the vertical shaft of the mill has been lifted out, as described, the crushing nuts or cones are left loose, so that they can be removed through the doorway afforded by the 6 5 hinged portion of the casing of the mill, and when the said crushing nuts or cones have thus been removed the stationary shells, which are bolted to the interior of the casing of the mill, are easily accessible for removal, if desired.

In the accompanying drawings, Figure 1 is a vertical section of a mill embodying the present invention, and Fig. 2 is an elevation of the same. Fig. 3 is a horizontal section taken on line 33, Fig. 1. Fig. 4c is a detail perspective view illustrative of the grabclutch.

Referring to the drawings, 12 denotes the base portion of the mill, which affords a gearchamber in which is located a bevel-gear l3, meshing with a pinion 1 L, suitably attached to a horizontal driving-shaft 15. The gearwheel 13 is provided with a depending hub .16, journaled in a bearing portion or hub 17 in the lower part of the base 12. Sui-mounting thedJase 12 is a casing forming the crushingchamber, said casing being formed in two parts, one of which, 18, is suitably bolted to the said base 12 and the otherofwhich, 19, 0 is: mounted on hinges 20, so thatwhen the bolts 21, which secure the two parts of the casing together, are removed the said hinged portion of the casing may be swung aside, as

a door, to afford convenient access to the crushing-chamber of the mill. The stationary shells 22 are bolted to the fixed and swinging portions of the mill-casing, and as the said hinged or swinging portion of the millcasing is, with its attached crushing-shells, of considerable weight the upper hinge-pin is preferably provided with astiff coil-spring 23, resting on the hinge projection of the upper stationary part of the casing and which spring will yieldingly support the said hinged or swinging portion of the mill-casing, so as to enable it to turn more readily on its hinges than it otherwise would.

Fixed to the top of the stationary portion 18 of the mill-casing is a hooded hopper 24, having a hub portion 25, into which is fitted a sleeve 26, in whichthe rounded upper portion of the vertical shaft 27 is journaled. The shaft 27 is provided with a reduced upper end portion or pintle 28, fitted onto which are two washers 29 and 30, having between them aseries of rollers or balls 31 to afford a roller or ball bearing which sustains the Weight of the vertical mill-shaft 27 and the parts supported'thereby. The lower washer 29 rests on an annular shoulder formed at the upper end of the sleeve 26, and between the upper washer 30 and a nut 32, screwed onto the upper end of the pintle 28, is interposed a stiff coil-spring 23, which serves as a reliefspring to cushion the vertical shaft 26 somewhat, so that it may yield slightly under extraordinary stress, as where some unerushable or unusually refractory pieces of material may get into the mill, thereby avoiding such sudden shocks or strains as might otherwise seriously injure the crushing elements of the mill.

The sleeve 26 is screw-threaded at its upper end for engagement with the lower screwthreaded portion of a thimble or cap 34, in which the nut 32 is housed, and which cap 34 is provided at its upper end with a hoistingeye 35, which may be engaged by the hook of any suitable form of hoisting apparatus when it is desired to lift the vertical shaft 27 of the mill. The cap 34 bears at its lower end against the upper end of the hub 25 of the hooded hopper of the mill, so that by turning the said cap in one direction or the other the sleeve 26 and the shaft 27, supported thereby, may be raised or lowered to adjust the lower rotating crushing shells or cones relative to their cooperating or opposing shells on the mill-casing for finer or coarser output. The sleeve 26 is restrained from rotation by a key 261 in said sleeve and extending into a vertical slot 251 in the hub 25. The said sleeve and the cap 34 collectively form a hoisting-head, by which the vertically-removable shaft 27 may be lifted out of the mill. The cap 34 also serves to exclude dust or grit from the upper bearing of the shaft 27.

The lower rotating crushing shell or cone 36 rests upon a key 37 passing through the squared portion of the vertical shaft 27, so that said key sustainstlie weight of the said lower crushing shell or cone and of the superposed crushing shells, cones, or nuts 37, 38, 39, and 40. Fitted to the lower part of the squared portion of the shaft 27 is a sleeve or hub 4'1, the lower face of which forms one member of a grab-clutch, the other member of which is formed on the upper face of the hub 42 of the beveled gear 13. Said beveled gear being rotated by the driving-pinion 19 will in turn through the grab-clutch just described rotate the shaft of the mill and the crushing nuts or cones mounted on the squared portion of the said shaft. The lower roundedend portion of the shaft 27 extends into the hub of the gear-wheel 13 and is steadied thereby as the said gear-wheel turns in the bearing portion 17 of the mill-casing, in which the depending hub portion 16 of said gear-wheel is journaled.

Encircling the sleeve 41 is a fixed dustexcluding sleeve 43, which extends upward into a chamber formed in a cap or cover 44, resting on the upper end. of the hub 41 and provided with wings or, scrapers 45, rotating in the upper part of the mill-chamber and serving to remove the crushed material from the chamber by carrying it around, so that it can run out of the discharge opening or chute 46 at one side of the base part of the mill. The sleeve 43, extending into the recess of the dust-cover 44, affords a dust-lock which.

will prevent the crushed material from working downward into the lower bearing afforded by the part 17 of the base portion of the mill, in which the hub 16 of the gear-wheel 13 rotates. To further exclude dust or grit from the said lower bearing, a dust-cap 47, fitted on the bearing portion or hub 17 and closely encircling the rotating hub 16, is provided.

From the foregoing it will be apparent that our novel construction provides means whereby convenient access to the interior of the crushing-chamber of the mill is afforded when the hinged or swinging portion of the millcasing is swung aside, and the invention further affords such a convenient means for suspending the vertical shaft of the mill on an upper ball-bearing so that the said shaft will run easily and so that it may be readily lifted out of the mill when desired for the purpose of enabling the crushing cones, nuts, or shells to be taken out of the mill, when worn or damaged, for replacement. Also the dust-locks provided are of such a character as to effectively exclude dust or grit from the rotating bearings, and thereby contribute to ease of running and durability.

Having thus described our invention, we claim and desire to secure by Letters Patent" 1. In a vertical crushing-machine, the combination with a vertical shaft having a portion which is of polygonal shape in cross-section and which shaft is provided at its upper end with a hoisting-head, of rotating crushing ele ments loosely strung on the said polygonal portion of said shaft, an upper hearing from which said shaft is supported, a mill-easing formed in two parts one of which is vertically hinged to the other so that it may be swung aside horizontally when access to the crushing member of the mill is desired, and a removable key which supports the lowermost of said rotating crushing elements: whereby, when the said key is removed, the said shaft may be hoisted out of the mill leaving the said rotating crushing elements free to be removed horizontally from the chamber of the mill when the said hinged portion or door of said casing is swung V portion of the'mill-easing, and which spring is arranged to sustain the weight of said swinging portion of said casing when the latter is swung aside as a door.

3. In a vertical crushing-mill, the combination with a casing having a vertically-hinged portion serving as a door, of a vertical shaft hung from its top and having a squared portion, rotating crushing elements loosely strung on the squared portion of said shaft, and aremovable key passing through said shaft and on which the lowermost of said rotating crushing elements rests.

4:. In a vertical crushing-mill, the combination with a casing having a vertically-hinged portion serving as a door adapted to be swung aside horizontally, of a vertical shaft hung from its top and having a squared portion, ro tating crushing elements loosely strung on the squared portion of said shaft, a removable key passing through said shaft and on which the lowermost of said rotating crushing elements rests, and means for adjusting said shaft vertically to vary the output of the mill.

5. In a vertical crushing-mill, the combination with a casing having a hinged portion serving as a door, of a vertical shaft hung from its top and having a squared portion, ro tating crushing elements loosely strung on the squared portion of said shaft, a key passing through said shaft and on which the lowermost of said rotating crushing elements rests, and means for adjusting said shaft vertically to vary the output of the mill, said means comprising the sleeve 26 which sustains the weight of the said shaft, a cap 34 having a screw-threaded connection with said sleeve, and a fixed hub or hearing portion 25 on which said cap rests.

6. In a vertical crushing-mill, the combinanation with a vertical shaft 27 having a squared portion, rotating crushing elements carried by the squared portion of said shaft and loosely strung thereon, an upper bearing which supports the weight of said shaft, and in which the upper end of the latter is journaled, said bearing comprising the sleeve 26, the cap 2% having a screw-threaded connection with said sleeve, the washers 29 and 30, balls interposed between said washers, the nut 32 screwed to the reduced upper end of said shaft, and the relief-spring 33 interposed between said nut and said washer 30.

7. In a vertical crushing-mill, the combination with a vertical shaft 27 having a squared portion, rotating crushing elements carried by the squared portion of said shaft and loosely strung thereon, an upper bearing which supports the weight of said shaft, and in which the upper end of the latter is journaled, said bearing comprising the sleeve 26, the cap 3% having a screw-threaded connection with said sleeve, the washers 29 and 30, balls interposed between said washers,the nuts 32 screwed to the reduced upper end of said shaft, and the relief-spring 33 interposed between said nut and said washer 30, said shaft being vertically removable from the top of the mill and the said cap being provided with a hoisting-eye to facilitate the removal of said shaft.

In testimony whereof we affix our signatures in presence of two witnesses.

THOMAS L. S'IURTEVANTI. THOMAS J. STURIEVANT. Witnesses:

W. H. ELLIs, L. H. STUR'IEVANT. 

